NAIL SOMEONE DOWN (ON SOMETHING)

nail someone down (on something): translation

pinsomeonedown†(onsomething)&nailsomeonedown†(onsomething)

Fig.to demand and receive a firm answer from someone to some question. (Alludes to shifting from answer to answer; commit to one answer or another.) •

I tried to pin him down on a time and place, but he was very evasive.

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Don't try to pin down the mayor on anything!

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I want to nail her down on a meeting time.